An engine exhibits erratic idling and excessive smoke after the induction manifold was reinstalled. What should be evaluated first regarding the diesel induction system's function?
Check for manifold air leaks affecting air supply consistency
The symptoms, erratic idling and heavy smoke, appeared right after the induction (intake) manifold was refitted, which points to something changed during that reinstallation.
If the manifold is not sealed properly, air can leak in past the gasket or joints. This unmetered leak upsets the air supply to the cylinders and disturbs the air-fuel ratio.
An inconsistent air charge makes idling unsteady and causes incomplete combustion, which shows up as excessive smoke, matching the observed faults.
Because the fault started with the manifold work, the first thing to evaluate is the manifold for air leaks affecting the air-supply consistency, before looking at the air cleaner, valves, or timing.
Hence, the answer is Check for manifold air leaks affecting air supply consistency.
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Which filter is used in the intake manifold of an engine?
- A system that forces fresh air into the exhaust ports or catalytic converter to reduce HC and CO emissions is called:
Which of the following is tightened with wing nuts?
Which of the following filters is fitted on the intake manifold?
